You have two options:

Stick with official plug and play devices like (s)nes classic mini Start a new hobby creating your own personalized Retropie system by starting from scratch. It's not that hard. All the information is readily available on this website. You may want to invest in a quality micro sd card first.

@maplestory Correct. It doesn't matter. Those lines relate to the extra folders - nvram, etc.

Thanks for reporting! Hope you're having fun.

Nethack or any of the its variants run fine on Linux and can probably run on a Pi.

Yeah, basically that. I feel daft now; I actually searched google for the terms "retropie randomizer" and all I got was stuff about splashscreens.
Thanks though, I'll give the kid mode rom roulette a try later and see if it's functional. Does anyone know if we CAN bring this feature to the normal ES mode with a script or something?

So, the random select seems to be working, and displaying the subfolders from what I can see. Great!

However, now when I select Shutdown System, it goes to a black screen with a blinking _ underscore instead of shutting off.

Edit: the same thing happens when I F4 out to he command line. The command line never appears, only the blinking underscore and black screen.

@BuZz Thanks mate :)

please have a thorough read of the complete wiki page, particularly https://github.com/retropie/retropie-setup/wiki/Child-friendly-EmulationStation#installation.
Again, make backups, expect bugs.

@madmodder123 there is a randomiser built in to the splash screen module already...